2019 Ram 2500 — coolant slowly disappears without an obvious leak — trying to narrow this down

Log the conditions before you spend. Loaded-suspension checks on the 2019 Ram 2500 catch play that a wheels-hanging inspection misses. You'll know quickly if you're on the wrong tree. On “coolant slowly disappears without an obvious leak,” that was the fork that mattered for me. If you share a photo of the worksheet, easier to sanity-check. Climate here is different, so treat that as a local data point. I'm in no rush to be a hero on it.

I wouldn't throw parts yet. Write temp, speed, and in-gear vs coast when the 2019 Ram 2500 does it — then decide on parts. If the cheap test changes it, stop and reassess. This is from a 2019 Ram 2500 in Phoenix with 93,000 miles. That's the whole play. Might be overthinking it, but I'd rather overthink than overspend.

OP update: scanned the 2019 Ram 2500 again and still only have the one pending code, no new lights. I already checked the easy fluid levels.

Cleared nothing. I want service to see the alert on the 2019 Ram 2500 first. Only after sitting overnight so far.

If it were in my driveway, if a shop can't duplicate it on the 2019 Ram 2500, bring a video plus freeze-frame data, not just a story. That's the branch I'd chase this week. This is from a 2019 Ram 2500 in Phoenix with 93,000 miles. Verbal 'we'll take care of it' is not a plan. Not driving it hard until I know more.

It did coolant slowly disappears without an obvious leak twice this week, both times after sitting. No change in mileage feel. Video is ugly but it shows the hesitation.

It did coolant slowly disappears without an obvious leak twice this week, both times after sitting. No change in mileage feel. Next check is the cheap one I can do in a driveway.

Intermittent stuff lies if you only catch it once. Write temp, speed, and in-gear vs coast when the 2019 Ram 2500 does it — then decide on parts. If the cheap test changes it, stop and reassess. On “coolant slowly disappears without an obvious leak,” that was the fork that mattered for me. If it doesn't change the out-the-door or the repair estimate, it's noise. Parking it somewhere I can hear it better next time.

I wouldn't throw parts yet. Swap the cheap/easy piece first on the 2019 Ram 2500 and see if the fault moves. If the cheap test changes it, stop and reassess. That's the whole play. That's my plan before I call anyone.

I wouldn't throw parts yet. Capture voltage while the 2019 Ram 2500 is actually failing — after it restarts you've lost the clue. If the cheap test changes it, stop and reassess. That's the whole play. Video is ugly but it shows the hesitation.

I'd want a measurement, not a hunch. Two 2019 Ram 2500s can feel identical and have different causes, so measure before you copy someone else's repair. Save the big job until that test fails. This is from a 2019 Ram 2500 in Phoenix with 93,000 miles. Was this after sitting overnight? I'd rather be boring and correct. No warning lights, which is why I'm documenting it.